Generation participation factors and transmission costing

Abstract

At present, the North American electric utility industry is undergoing fundamental changes that will effect the means by which revenues are generated. One of the revenue streams that will gain importance is the transmission line tariff. Re-regulation in this industry will necessitate some means for estimating the contributions made by each system generator to the total power flow in the transmission system in order to approximate the tariff costs in advance. The existing literature dealing with tariff rate design presents only the traditional methods for attributing the current in transmission lines to their sources. One such method is the procedure of performing successive load flow studies. This thesis discusses some of the proposed toll schemes and presents a mathematical derivation for decomposing the total power flow in a transmission line into components attributable to contributing generators. The method is based on the use of the inverse admittance matrix for a system configuration and the results from load flow solutions. It has been successfully applied to a modified standard IEEE 14 bus system in an effort to evaluate its suitability for application to the many proposed tariff schemes that apportion the cost of the physical plant between users. The simulations produce satisfactory results and indicate that this simplified method is suited to the philosophy of the costing methodologies anticipated under the emerging deregulation regime. For its application, the proposed method requires only one load flow solution for the operating point and configuration in question. The technique can be easily incorporated into system planning software as an important feature.